The western brown snake (Pseudonaja mengdeni) is commonly known as Mengden's brown snake, and alternatively, gwardar.

Pseudonaja mengdeni is endemic to Australia. It is highly variable in colour and patterns and is a highly dangerous elapid whose bite can cause severe symptoms resulting in death. It is one of the three species originally classified as Pseudonaja nuchalis along with P. aspidorhyncha, and P. nuchalis.

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